JP2015118915A - Magnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic contactor which can use a coil having a broad rated use voltage range, and in which a structure of a product is simplified and a space can be used broadly.SOLUTION: A magnetic contactor according to an embodiment of the present invention includes: frames 111, 112; a bobbin 150 which is provided at the inside of the frames 111, 112 and includes a hollow part 154 at the inside of the bobbin and a coil 156 wound around an outer surface of the bobbin; a movable core 131 movably inserted into the hollow part 154 in an axial direction; a yoke 160 which is provided to face an outside surface of the bobbin 150 and to be separated from the coil 156, and is configured to act as a fixed core; and a manipulating circuit part 170 which is disposed at the outside surface of the bobbin 150 in parallel with a moving direction of the movable core 131 and provided at one side surface of the yoke 160.

Description

  The present invention relates to a magnetic contactor (MC) that can use a coil having a wide range of rated operating voltage and is compactly configured.

  In general, an electromagnetic contactor is a device that opens and closes a power source (current) flowing in a main circuit using the principle of an electromagnet. Magnetic contactors are classified into, for example, small and medium capacity products of less than 130A and large capacity products of 130 to 800A depending on the capacity of current.

  FIG. 24 is an exploded perspective view schematically showing a configuration of a general small and medium capacity electromagnetic contactor. The general small and medium capacity electromagnetic contactor includes a first frame 11, a movable core 12, a return spring 13, a bobbin 14, It is composed of a fixed core 15 and a second frame 16.

  The bobbin 14 is a hollow cylindrical iron core, and when an external power supply is supplied to the coil 14a wound around the outer surface of the bobbin 14, a magnetic field is generated around the coil 14a, and an E-shape is generated by the magnetic field. The fixed core 15 is magnetized to become an electromagnet.

  Then, the movable core 12 of the conductor is attracted and pulled downward by the magnetic force of the fixed core 15 serving as an electromagnet, and the movable contact mechanically connected to the movable core 12 is lowered to contact the fixed contact. Current flows in the circuit.

  If power is not supplied to the coil 14 a in this state, the magnetic field generated around the coil 14 a disappears, so that the movable core 12 positioned above the return spring 13 is returned to the original position by the urging force of the return spring 13. As a result, the movable contact is separated from the fixed contact, whereby the current flowing in the main circuit is interrupted.

  On the other hand, in the conventional electromagnetic contactor, the rated operating voltage of the coil for operating the main contact (movable contact and fixed contact) varies depending on the product. For example, the rated working voltage of the coil used for the conventional electromagnetic contactor is 24V, 48V, 100V, 220V, 240V, 380V, 440V, 480V, 600V, etc. The rated operating voltage is indicated. That is, the coil which can be used for an electromagnetic contactor is determined by the rated use voltage of the coil.

  Here, according to the safety standard of the magnetic contactor, as a first condition, in order to ensure the reliability of the operation of the switch, the external power supply voltage supplied to the coil is in the range of 85 to 110% of the rated operating voltage of the coil. However, for example, when the rated operating voltage of the coil is 100V, even if the external voltage supplied to the coil is 85V, the movable contact must operate so as to contact the fixed contact. This is because the voltage of the power system varies depending on the area and place where the magnetic contactor is used.

  As a second condition, even if the external power supply current supplied to the coil continues for a predetermined time (for example, 2 hours) or more, the temperature of the coil must not exceed the limit temperature (for example, 65 ° C.). This will be described with reference to FIG. 25 which is a circuit diagram of an operation circuit unit of a general small-capacity electromagnetic contactor. In the operation circuit unit, an external power supply voltage is applied to both ends of the coil L as it is. This is because if the external power supply current continues to be supplied to the coil L, the temperature of the coil L exceeds the limit temperature, and the movable contact may not operate due to an increase in the resistance of the coil L.

  However, in the conventional small-capacity electromagnetic contactor, when the external power supply voltage supplied to the coil L is 85% of the rated operating voltage of the coil L, the movable contact is initially operated, but is supplied to the coil L. When the external power supply current continues for a predetermined time or more, there is a problem that the connection state of the contact cannot be maintained due to deterioration of the coil L and increase in resistance.

  Therefore, both the first and second conditions according to the safety standard of the electromagnetic contactor must be satisfied.

  Further, in the conventional electromagnetic contactor, the movable core 12 and the fixed core 15 are formed in an E shape, and the space that occupies the inside of the frame is large. Therefore, there is a limit to the simplification of the product structure and the miniaturization of the product. there were.

  The present invention has been made to solve such problems, and the technical problem of the present invention satisfies both the first and second conditions according to the safety standards of conventional electromagnetic contactors, and has a wide range. An object of the present invention is to provide an electromagnetic contactor capable of using a coil having a rated operating voltage range.

  Another technical problem of the present invention is to provide an electromagnetic contactor that can contribute to downsizing of a product by simplifying the structure of the product.

  In order to solve the above technical problem, according to one aspect of the present invention, an electromagnetic contactor including a frame, a bobbin, a movable core, a yoke, and an operation circuit unit is provided.

  The bobbin may be provided inside the frame, provided with a hollow portion inside, and a coil wound around the outer surface.

  The movable core may be inserted into the hollow portion so as to be movable in the axial direction.

  The yoke may be provided so as to face the outer surface of the bobbin and be separated from the coil, and serve as a fixed core.

  The operation circuit unit may be disposed on the outer side surface of the bobbin in parallel with the moving direction of the movable core and provided on one side surface of the yoke.

  In one embodiment of the present invention, the movable core has a cylindrical structure, and the yoke has a U-shaped box-shaped structure, so that a space can be secured on the side surface of the fixed core, thereby enabling a compact configuration.

  In addition, by providing a switch-switch built-in type operation circuit section in the side space of the secured fixed core, and reducing the current consumption supplied to the coil by the circuit structure of the operation circuit section, the rated operating voltage of the coil Not only can the contacts operate within the range and allowable temperature limits, coils with a wide range of rated operating voltages can be used.

  The movable core may be formed in a cylindrical shape.

The yoke may be detachably coupled to a side surface of the bobbin.
The yoke may include a first yoke and a second yoke configured to be able to contact and separate.
Each of the first yoke and the second yoke may include a contact portion and a connecting portion.

The contact portions may be spaced apart in the axial direction of the bobbin.
The connecting portion may be arranged in parallel with the moving direction of the movable core and connect the end portions of the contact portion.

The first yoke and the second yoke may be in contact with each other.
Each of the first yoke and the second yoke is provided with a semicircular opening in one of the contact portions to allow insertion of the movable core, and the other of the contact portions has a closed structure. The movement of the movable core may be stopped.

  The operation circuit unit may include a printed circuit board (PCB), a changeover switch, and a voltage drop element.

  The change-over switch may be provided on the printed circuit board and may be turned on / off opposite to the contact of the main circuit.

  The voltage drop element may be provided on the printed board, and may reduce the voltage applied to the coil by dropping an externally applied voltage when the changeover switch is switched.

  The voltage drop element may be a capacitor.

  The operation circuit unit may include a rectifying element that converts an external power source from AC to DC.

  The bobbin may be provided with yoke insertion portions that are arranged at both ends of the bobbin main body so as to be spaced apart from each other in the moving direction of the movable core and guide the insertion of the yoke.

  According to the first embodiment of the present invention, the frame may include a holder.

The holder may be movably provided inside the frame.
The holder may include a support guide portion to support the movable core.

  The movable core may include a connecting member, a support base, and a support pin.

  The connecting member may be coupled to one end of the movable core.

The support base may be provided on the connecting member.
The support base may include insertion holes on both side surfaces.

  The support pin may be assembled through the insertion hole and slidably inserted into the inner side surface of the support guide portion.

  The changeover switch may be integrated with the operation circuit unit and modularized.

  The bobbin may include a coil power input terminal and a coil power input member.

  The coil power supply input terminals may be provided on the power supply side and the load side, respectively, and connected to an external terminal.

  The coil power input member may connect the coil power input terminal and the operation circuit unit and supply the external power to the operation circuit unit.

  The changeover switch may be disposed between the coil power supply input terminal and the rectifying element.

  According to the second embodiment of the present invention, the frame may include a holder.

The holder may be movably provided inside the frame.
The holder may include a support guide portion to support the movable core.

  The movable core may include a connecting member and a support base.

  The connecting member may be coupled to one end of the movable core.

The support base may be provided on the connecting member.
The support base may include sliding protrusions projecting from both side surfaces toward each other, and may be slidably coupled to the support guide portion.

  In the magnetic contactor according to the present invention, overheating of the coil can be prevented, and a coil having a wide range of rated operating voltage can be used. In addition, the structure of the product is simplified and the space can be used widely.

It is a disassembled perspective view which shows the structure of the electromagnetic contactor by one Embodiment of this invention. 1 is an assembled perspective view of a small-capacity electromagnetic contactor according to an embodiment of the present invention, and shows an internal configuration by partially cutting a power supply side surface portion of a frame. It is a perspective view of a movable part by a 1st embodiment of the present invention. It is a perspective view which shows the state before the movable part of FIG. 3 is couple | bonded with a holder. It is a perspective view which shows the state after the movable part of FIG. 3 was couple | bonded with the holder. It is a perspective view of the movable part by 2nd Embodiment of this invention. It is sectional drawing which shows the state by which the holder and movable part by 1st Embodiment of this invention were couple | bonded. It is sectional drawing which shows the state by which the holder and movable part by 2nd Embodiment of this invention were couple | bonded. It is sectional drawing which shows the state by which the holder and movable part by 3rd Embodiment of this invention were couple | bonded. It is a disassembled perspective view of the fixing | fixed part by one Embodiment of this invention. It is a top view of the fixing | fixed part shown in FIG. It is the XIV-XIV sectional view taken on the line of FIG. It is the XV-XV sectional view taken on the line of FIG. It is a perspective view showing a state where a yoke is coupled to a bobbin according to an embodiment of the present invention. FIG. 15 is a plan view of FIG. 14. It is the XVIII-XVIII sectional view taken on the line of FIG. It is the XVIV-XVIV sectional view taken on the line of FIG. It is a graph which shows the relationship between the distance (1) between two conductors with which a magnetic force acts, and the magnitude | size of a magnetic force (F). It is a circuit diagram of the operation circuit part by one Embodiment of this invention. It is sectional drawing which shows the state before operation | movement of the electromagnetic contactor by one Embodiment of this invention. It is a circuit diagram for demonstrating that an external power supply is supplied to a coil via a changeover switch by this invention. It is a circuit diagram for demonstrating that an external power supply is supplied to a coil through a capacitor | condenser by this invention. It is sectional drawing which shows the state after operation | movement of the electromagnetic contactor of FIG. It is a disassembled perspective view which shows the structure of a common small and medium capacity | capacitance electromagnetic contactor roughly. It is a circuit diagram of the operation circuit part of a general small capacity | capacitance electromagnetic contactor.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily carry out the present invention.

  The present invention relates to an electromagnetic contactor capable of reducing the structure of a product and allowing an operating coil to have a wide range of rated operating voltages.

  FIG. 1 is an exploded perspective view showing a configuration of an electromagnetic contactor according to an embodiment of the present invention.

  As shown in FIG. 1, an electromagnetic contactor according to an embodiment of the present invention includes a first frame 111, a holder 120, a movable part 130, an elastic member 140, a fixed part 180, an operation circuit part 170, a second frame 112, and the like. Including.

  The first frame 111 and the second frame 112 are formed in a rectangular box shape and form an external skeleton of the product.

  The holder 120 includes a columnar column member 121 disposed perpendicularly to the center, a base member 122 disposed at the lower end of the column member 121, and a three-phase movable contact 123 provided in a row on both side surfaces of the column member 121. including.

  The movable portion 130 is provided on the upper end of the cylindrical movable core 131, the movable core 131, the coupling member 132 for coupling the holder 120 and the movable core 131, the coupling member 132, and the movable core 131. And a support stand 134 for supporting the holder 120 on the holder 120.

  The diameter of the movable core 131 is smaller than the inner diameter of the bobbin 150 located at the fixed portion 180. That is, the diameter of the movable core 131 is much smaller than the length in the left-right longitudinal direction of the first frame in the conventional E-shaped movable core. On the other hand, the length of the movable core 131 in the axial direction (vertical direction in FIG. 1) is longer than that of the conventional E-shaped movable core. The movable core 131 having such a structure can be inserted into the bobbin 150 in the axial direction. With the movable core 131 having such a structure, the diameter of the bobbin 150 can be reduced, and the side space between the inner surface of the second frame 112 and the bobbin 150 can be used as an installation space for the operation circuit unit 170. .

  The elastic member 140 plays a role of returning the movable part 130 and the holder 120 to their original positions by an urging force when no external power is supplied to the coil 156. As the elastic member 140, a coil spring in which a coil is spirally wound may be used.

  The fixing unit 180 includes a bobbin 150 that includes a coil 156 and generates a magnetic field, and a yoke 160 that is coupled to the side surface in the width direction of the bobbin 150 in a box shape.

  The operation circuit unit 170 includes a printed circuit board 171 disposed perpendicular to the power supply side surface space of the bobbin 150 and a changeover switch 172 attached on the printed circuit board 171.

  FIG. 2 is an assembled perspective view of a small-capacity electromagnetic contactor according to an embodiment of the present invention, and shows an internal configuration by partially cutting a power supply side surface portion of a frame.

  As shown in FIG. 2, the lower end frame portion of the first frame 111 opened downward and the upper end frame portion of the second frame 112 opened upward contacted and assembled, and the assembled first and second frames 111 and 2 are assembled. An accommodation space is formed inside the frame 112 to accommodate the holder 120, the movable part 130, the fixed part 180, the elastic member 140, and the operation circuit part 170.

  The holder 120 is provided with a pressing portion 124 projecting from an upper end portion thereof, and is provided inside the first frame 111 so as to be movable in the vertical direction. The pressing part 124 is exposed to the outside of the first frame 111 so that the user can manually operate the holder 120.

  A part of the front surface (power supply side) of the first frame 111 is cut away, and a movable contact 123 is provided on one side surface of the holder 120 so as to be movable in the vertical direction. The movable contact 123 is biased by a spring.

  A three-phase (R, S, T phase) main power supply terminal is provided in the first frame 111, and a fixed contact 113 is fixedly installed at the end of the power supply side main power supply terminal, spaced downward from the movable contact 123. The

  Therefore, when the user presses the pressing portion 124 of the holder 120 or due to the attractive force of the electromagnet generated by the supply of the external power source to the coil 156, the movable portion 130 and the holder 120 are lowered and integrated with the holder 120. The moving movable contact 123 moves down and contacts the fixed contact 113.

  Also, a main power terminal fixing member is separately provided for each of the three phases on the fixed contact 113 in the first frame 111, and the power supply side and load side electric wire terminals are inserted and fixed on the main power terminal using the fixing members. You may do it.

  The movable part 130 includes a square plate-like connecting member 132 disposed on the upper part of the movable core 131, a switch operation part 133 that protrudes horizontally from one side of the connection member 132, and a bottom surface of the switch operation part 133. And a switch operation protrusion 133a projecting downward.

  The connecting member 132 has a connecting function for connecting the movable core 131 to the holder 120, and a switch operation for switching the internal contact by pressing the switch operation lever 172a of the changeover switch 172 located below the switch operation unit 133 by the switch operation protrusion 133a. With functions. Here, switching of the internal contact means switching the internal contact from the on position to the off position.

  The coil spring 140 may be disposed between the lower end portion of the holder 120 and the upper end portion of the bobbin 150. Here, the coil spring 140 may be formed such that the diameter of the upper end is smaller than the diameter of the lower end. The upper end portion of the coil spring 140 is supported in contact with the lower end portion of the holder 120 to apply a biasing force to the lower end portion of the holder 120, and the lower end portion of the coil spring 140 is fixed to the upper end portion of the bobbin 150.

  The bobbin 150 of the fixing unit 180 includes a coil power input member 152 made of a conductive material connected to an external coil power input terminal (not shown) at the upper end, and an operation circuit unit on one side of the coil power input member 152. 170 printed circuit boards 171 are directly coupled via a connection ring 174. Accordingly, the external power input to the coil power input terminal 151 can be directly supplied to the operation circuit unit 170 by the coil power input member 152 of the bobbin 150 without going through a separate part. Here, the coil power input member 152 is configured as a part of the bobbin 150 and is insulated by a plate-like insulating member made of an insulating material such as plastic.

  By utilizing the side space on one side (front side in FIG. 2) of the bobbin 150 as an installation space for the printed circuit board 171 of the operation circuit unit 170, there is an advantage in that it is advantageous for simplifying the product and reducing the size. . That is, the printed circuit board 171 of the operation circuit unit 170 is disposed in the side space of the bobbin 150 in parallel with the moving direction of the movable core 131, so that interference with the movable core 131 can be avoided. When the printed circuit board 171 is disposed horizontally on the top of the bobbin 150, an insertion hole for penetrating and moving the movable core 131 must be secured in the printed circuit board 171. Therefore, a part of the area of the printed circuit board 171 is required. There is a drawback that it becomes impossible to utilize. In addition, due to the interference between the movable core 131 and the printed circuit board 171, space constraints are imposed when the movable core 131 and the spring (elastic member 140) are arranged and designed. Further, a processing step for forming a movement securing insertion hole in the printed board 171 is added, and a space for installing an electronic component on the printed board 171 is reduced by the area of the insertion hole. In other words, this is a factor that hinders downsizing of the product.

  In addition, a changeover switch 172 and a capacitor 173 as a voltage drop element are integrally provided on the printed circuit board 171, and a strip-like switch operation lever 172a is diagonally coupled to one surface of the changeover switch 172 with a hinge structure. Is connected to the external power source via the selector switch 172 with the contact closed, and the switch 172 is pressed by the switch operating projection 133a of the movable portion 130 to switch the external power source via the capacitor 173. The current flows through the coil 156, and the voltage of the external power supply is lowered by the capacitor 173 to reduce the current consumption supplied to the coil 156.

  Thus, even when the power consumption of the coil 156 is reduced, the attractive force of the electromagnet for maintaining the contact state between the movable contact 123 and the fixed contact 113 can be ensured.

  FIG. 3 is a perspective view of the movable part according to the first embodiment of the present invention.

  As shown in FIG. 3, the movable part 130 according to the first embodiment includes a cylindrical movable core 131, a connecting member 132 provided on the upper end of the movable core 131, and a support pin 135 provided on the connecting member 132. And a support base 134 coupled to the holder 120.

  The connecting member 132 is formed in a square plate shape, and a switch operation portion 133 is provided on one side of the connecting member 132 so as to protrude in the power supply direction so that the changeover switch 172 can be pressed.

  Here, a circular coupling portion 131a having a smaller diameter than the movable core 131 is provided in the axial direction at the upper end portion of the movable core 131, and through holes are formed in the bottom surfaces of the connecting member 132 and the support base 134, respectively. The The coupling portion 131a of the movable core 131 passes through the connection member 132 and the through hole of the support base 134 and is fastened by fastening means such as a rivet, whereby the connection member 132 and the support base 134 are attached to the upper end portion of the movable core 131. It is fixed integrally.

  The support table 134 includes a square plate-shaped support body formed so as to be in surface contact with the upper surface of the connecting member 132, a side surface portion extending upward from both side end portions of the support body, and the side surface portion. And a formed insertion hole 134a.

  A support pin 135 is penetrated and coupled to the insertion hole 134a of the support base 134 in the lateral direction, and the movable core 131 can be mechanically connected to the holder 120 by using the support pin 135 to operate integrally.

  4 is a perspective view showing a state before the movable part of FIG. 3 is joined to the holder, and FIG. 5 is a perspective view showing a state after the movable part of FIG. 3 is joined to the holder.

  As shown in FIG. 4, a support guide part 125 protrudes from the bottom surface of the holder 120, a guide groove 125 a is continuously formed in the longitudinal direction inside the support guide part 125, and the support pin 135 is a movable part 130. It is slidably inserted and coupled to the guide groove 125a in a state of being incorporated in the support base 134.

  As shown in FIG. 5, when the support pin 135 is inserted and coupled to the guide groove 125a, the holder 120 and the movable portion 130 operate integrally so as to be vertically movable inside the first frame 111 and the second frame 112. To do.

  FIG. 6 is a perspective view of a movable part according to the second embodiment of the present invention.

  The movable part 230 according to the second embodiment includes a cylindrical movable core 131, a square plate-like connecting member 232, and a support base 234 as the same components as those of the first embodiment. But in 2nd Embodiment, the width | variety of the switch operation part 233 protrudingly provided by the one end part of the connection member 232 is narrower than the width | variety of the switch operation part 133 of 1st Embodiment. In addition, the switch operation protrusion 233a according to the second embodiment is formed by being bent downward from the end of the switch operation unit 233, but the switch operation protrusion 133a according to the first embodiment is an end of the switch operation unit 133. To the movable core 131 direction inside. Further, the support base 234 according to the second embodiment includes a sliding protrusion 234a that protrudes laterally from the side surface of the support base 234, and is inserted and coupled to the support guide part 125 of the holder 120. The support pin 135 as in the first embodiment is not necessary.

  FIG. 7 is a cross-sectional view illustrating a state in which the holder and the movable portion according to the first embodiment of the present invention are coupled, and FIG. 8 illustrates a state in which the holder and the movable portion according to the second embodiment of the present invention are coupled. FIG. 9 is a cross-sectional view showing a state where the holder and the movable part according to the third embodiment of the present invention are coupled.

  The support pin 135 of the movable part 130 shown in FIG. 7 is inserted and coupled to the support guide part 125 of the holder 120, so that the holder 120 and the movable part 130 can be integrally interlocked in the vertical direction.

  The sliding protrusion 234a of the movable part 130 shown in FIG. 8 protrudes outward from the side surface part of the support base 234 and is inserted and coupled to the support guide part 125 of the holder 120, whereby the holder 120 and the movable part 230 are separated. It becomes possible to work together in the vertical direction.

  As the sliding protrusion 334a of the movable part 130 shown in FIG. 9 protrudes inward from the side surface part of the support base 334 and is inserted and coupled to the support guide part 325 of the holder 120, the holder 120 and the movable part 330 are It becomes possible to work together in the vertical direction.

FIG. 10 is an exploded perspective view of a fixing portion according to an embodiment of the present invention.
As shown in FIG. 10, the fixing portion 180 includes a bobbin 150 and yokes 160 coupled to both side surfaces of the bobbin 150 in the width direction.

  The bobbin 150 includes a cylindrical bobbin main body 150a and a box-shaped yoke insertion portion 153 formed in a concave shape at the upper and lower ends of the bobbin main body 150a, and an opening is formed on the side surface in the width direction of the yoke insertion portion 153. The yoke 160 is inserted and coupled from the side opening.

The bobbin main body 150a has a hollow portion 154 inside, and a coil is wound around the outer surface.
In particular, a coil power input terminal 151 is provided at both longitudinal ends of the upper end of the bobbin 150, and external power is supplied via the coil power input terminal 151.

  In addition, a coil power input member 152 is provided at the upper end of the bobbin main body 150a, and the coil power input member 152 is formed in a flat plate shape so that the coil power input terminal 151 and the operation circuit unit 170 are directly connected to each other. An energization path between the power input terminal 151 and the operation circuit unit 170 is provided.

  Further, a coil terminal 155 is provided at the lower end of the bobbin 150, and the coil terminal 155 is directly connected to the operation circuit unit 170 and supplies a current controlled by the operation circuit unit 170 to the coil 156.

  The yoke 160 has a structure in which a plate is bent into a U-shaped cross section in which one surface is open and the remaining three surfaces are closed. The upper end portion 160a and the lower end portion 160b of the yoke 160 that has been bent are inserted into the yoke insertion portions 153 provided at the upper end portion and the lower end portion of the bobbin 150 by sliding in the width direction of the bobbin 150, and abut against each other. Assembled.

  A circular opening is formed in the upper end portion 160 a of the yoke 160, and the movable core 131 is inserted into the hollow portion 154 of the bobbin 150 from the opening.

  The lower end portion 160b of the yoke 160 is closed in a planar shape, and serves as a stopper that prevents the movable core 131 from being lowered more than a predetermined distance when the movable core 131 is lowered.

  The connecting portion 160c that connects the upper end portion 160a and the lower end portion 160b of the yoke 160 forms a magnetic path of the magnetic field generated around the coil 156, and magnetizes the entire yoke 160 by the magnetic field.

  11 is a plan view of the fixing portion shown in FIG. 10, FIG. 12 is a sectional view taken along line XIV-XIV in FIG. 11, and FIG. 13 is a sectional view taken along line XV-XV in FIG.

  As shown in FIG. 12, a coil power input terminal 151 is provided at the upper end of the bobbin 150, and external power is supplied to the operation circuit unit 170 via a coil power input member 152 provided at the upper end of the bobbin 150. .

  The operation circuit unit 170 is directly coupled to the power supply side surface of the bobbin 150 via the connection ring 174, so that the operating voltage of the coil 156 can be applied from the outside without using a separate component. .

  Here, the operation circuit unit 170 includes a planar printed circuit board 171 arranged in the vertical direction, a changeover switch 172 attached to the upper end of the printed circuit board 171, and a width direction of the bobbin 150 from the changeover switch 172 to the printed circuit board 171. And a capacitor 173 provided so as to be separated from each other.

  The changeover switch 172 includes a strip-like switch operation lever 172a provided on the upper surface of the switch body and a fixed contact and a movable contact provided in the switch body.

  Here, the changeover switch 172 normally has an internal contact closed, and when a signal is supplied from the outside by the switch operation lever 172a, the internal movable contact is operated to separate (turn off) the fixed contact. B) Contact switch may be used.

  When an external power supply is supplied, the changeover switch 172 connects the coil power supply input terminal 151 and the coil 156 so that a current is supplied from the coil power supply input terminal 151 to the coil 156.

  The changeover switch 172 is supplied with a signal from the outside by the mechanical operation of the movable unit 130. That is, as shown in FIG. 2, the switch operation lever 172a of the changeover switch 172 is pressed by the lowering of the switch operation projection 133a of the movable part 130 by the attractive force of the electromagnet, and the changeover switch 172 is switched. Here, switching means turning off the closed (on-state) internal contact.

  The switch operation lever 172a includes a hinge portion formed by being bent at a lower end portion, the hinge portion is embedded in the switch body, the upper end portion is a free end, and is pressed by the switch operation protrusion 133a. The internal movable contact is separated from the fixed contact.

  The switch operation lever 172a has an elastic strip structure, and when the pressing force of the switch operation projection 133a is released, the switch operation lever 172a returns to the original position by the urging force. Further, as shown in FIG. 2, an arc-shaped contact end 172a 'is formed at the end of the switch operation lever 172a, so that the contact with the switch operation protrusion 133a of the movable portion 130 is easy.

  At the same time that the changeover switch 172 is switched, the operation circuit unit 170 causes the current input via the coil power supply input terminal 151 to pass through the capacitor 173 and consumes the current supplied to the coil 156, thereby A suction force for maintaining the contact state between the movable contact 123 of the main power supply and the fixed contact is applied with a low power consumption of 156.

  The bobbin 150 includes a cylindrical coil winding portion 150a having a hollow portion 154 therein, and a flange portion 150b protruding outward from the upper end and the lower end of the coil winding portion 150a.

  The coil winding part 150a is wound around the outer surface of the coil 156, and when an external power source is supplied to the coil 156, it generates a magnetic field to become an electromagnet. Here, the coil winding part 150a may be made of an iron core and increase the magnetic field generated inside.

  The flange portion 150b disposed at the upper end portion and the lower end portion of the bobbin 150 includes a yoke insertion portion 153 formed in a concave shape on the inside, and guides the straight insertion in the width direction (XV-XV direction in FIG. 11) of the yoke 160. And support.

  14 is a perspective view showing a state where a yoke is coupled to a bobbin according to an embodiment of the present invention, FIG. 15 is a plan view of FIG. 14, and FIG. 16 is a cross-sectional view taken along line XVIII-XVIII of FIG. 17 is a cross-sectional view taken along line XVIV-XVIV in FIG.

  As shown in FIG. 14, a yoke 160 having a U-shaped cross-section with a semicircular opening formed at the upper end is symmetrical with respect to the longitudinal center line of the bobbin 150 (XVIII-XVIII in FIG. 15). When the bobbin 150 is inserted from both side surfaces in the width direction via the yoke insertion portions 153 of the bobbin 150 and joined together, the opening at the upper end of the yoke 160 becomes circular. The opening at the upper end of the yoke 160 coincides with the opening at the upper end of the bobbin 150, and the movable core is inserted into the hollow portion 154 of the bobbin 150 from the opening.

  As shown in FIG. 16, the yoke 160 serves as a fixed core with respect to a magnetic field generated when power is supplied to the coil 156, and the upper end portion and the lower end portion of the yoke 160 are the connection member 132 and the movable core of the movable portion 130. By being spaced apart from the bottom surface of 131 so as to face each other in the axial direction, the suction force between the upper end portion of yoke 160 and connecting member 132 of movable portion 130 can be maximized.

  Further, the moving distance of the movable part 130 is determined by the distance (distance l) between the bottom surface of the movable core 131 and the lower end part of the yoke 160. This is because the lower end portion of the yoke 160 serves as a stopper, and when the movable core 131 is lowered, the lower end portion of the movable core 131 abuts against the bottom surface of the yoke 160 and does not descend any further.

  FIG. 18 is a graph showing the relationship between the distance (l) between two conductors on which a magnetic force acts and the magnitude of the magnetic force (F).

  When a magnetic field is generated from the coil, a magnetic force acts between the movable part and the fixed part. In the present invention, the magnetic force refers to the attractive force F at which the fixed portion attracts the movable portion, and the distance between the objects on which the magnetic force acts refers to the distance l between the bottom surface of the movable core and the lower end portion of the yoke.

  Here, the relational expression of the magnetic force F and the distance l between the objects on which the magnetic force acts is as follows.

ここで、ｋは比例常数であり、Ｉは電流［Ａ］である。

Here, k is a proportional constant, and I is a current [A].

  In Equation 1, the magnetic force (attraction force) F is inversely proportional to the square of the distance l between the objects on which the magnetic force acts.

  As a result, when the same current is supplied, when the distance l between the bottom surface of the movable core and the lower end of the yoke is shortened, the magnetic force acting between the movable part and the fixed part increases in inverse proportion to the square of the distance l. To do.

  That is, before the external power is supplied to the coil, the distance l between the bottom surface of the movable core and the lower end of the yoke becomes the maximum value. When the external power is supplied to the coil, the electromagnet The distance l between the lower end portions is gradually shortened, and the magnetic force between the movable portion and the fixed portion is increased according to the above formula 1.

Before the external power is supplied to the coil, the movable contact is separated from the fixed contact, but when the initial magnetic force for moving the movable contact separated from the fixed contact to the fixed contact is F ₀ , the initial magnetic force When F ₀ is generated, the distance l is shortened, thereby increasing the magnetic force F. Once the movable contact and the fixed contact abut, the magnetic force for maintaining the contact state of the contact portion may be much smaller than the initial magnetic force F ₀ . This means that the contact state of the contact portion can be sufficiently maintained even if the power consumption of the coil is reduced after the contact portion is contacted.

  Accordingly, in the present invention, by reducing the power consumption of the coil at the time of maintaining the contact of the contact portion, the coil temperature is made lower than the conventional coil temperature to prevent the resistance of the coil 156 from increasing, and the safety standard The contact can be operated at 85% of the rated operating voltage of the coil in accordance with the above, and both of the two conditions of not exceeding the limit temperature of the coil when maintaining contact of the contact can be satisfied. .

  FIG. 19 is a circuit diagram of an operation circuit unit according to an embodiment of the present invention.

  The operation circuit unit according to the present invention includes a flat printed board 171, a changeover switch SW, a capacitor C as a voltage drop element, a rectifying element B / D, and the like.

  The printed circuit board 171 is an electronic board for mounting electronic components such as the changeover switch SW as one module.

  The changeover switch SW has a function of sensing that the distance l between the movable core 131 to which the magnetic force acts and the yoke 160 is shortened, and how much the distance l is shortened according to Equation 1 above. As long as a person skilled in the art can verify by observation and experiment that the magnetic force becomes remarkably larger as the temperature increases, the present invention is not particularly limited.

  The change-over switch SW is located within a distance that the switch operation protrusion 133a of the movable part 130 can move, and is supplied with a physical contact signal from the switch operation protrusion 133a of the movable part 130, that is, It is detected that the distance l between the movable core 131 and the yoke 160 is shortened by pressing the switch operation lever 172a of the changeover switch SW by the switch operation protrusion 133a. At this time, the external power supply can flow to the capacitor C at the same time as the changeover switch SW is switched.

  The capacitor C used as a voltage drop element in the present invention is connected to both ends of the changeover switch SW and has a voltage distribution function and a voltage drop function. Here, the capacitor C is connected in series between the external power supply input terminals P1 and P2 and the coil L, and plays a role of distributing voltage, and for the coil L, it plays a role of lowering the voltage applied to the coil L. Fulfill. For example, when the external power supply voltage is 100 V, the capacitor C distributes 20 V to the capacitor C and 80 V to the coil L, and for the coil L, the input voltage from the external power supply is reduced from 100 V to 80 V.

  The rectifying element B / D may be configured with a bridge diode. The rectifying element B / D has a DC conversion function for converting (rectifying) AC (alternating current) power supplied via the changeover switch SW or the capacitor C into DC (direct current) power. That is, the direct current converted by the rectifying element B / D is supplied to the coil L, so that an attractive force that moves the movable part 130 in the direction of the fixed part 180 is generated.

  FIG. 20 is a cross-sectional view showing a state before the operation of the magnetic contactor according to the embodiment of the present invention. FIG. 21 is a diagram for explaining that an external power source is supplied to the coil via the changeover switch according to the present invention. It is a circuit diagram.

  The circuit operation state of the operation circuit unit 170 having such a circuit structure will be described as follows.

  Referring to FIG. 20, the movable contact 123 and the fixed contact 113 located inside the first frame 111 are separated from each other.

  In order to supply main power to the load side, external power is supplied to the coil 156 via the changeover switch 172. Before the external power supply is supplied to the coil 156, the distance l between the movable core 131 and the yoke 160 is the maximum, so that the attractive force for pulling the movable core 131 toward the yoke 160 and putting the movable contact 123 into the fixed contact 113 is used. Must be larger than when maintaining contact of the contact portions (movable contact 123 and fixed contact 113).

  As shown in FIG. 21, when external power is supplied via the coil power supply input terminals P1 and P2, the rectifying element B / D (bridge diode) passes through the changeover switch SW in which the input current is normally on. ) Is converted from an AC current to a DC current and supplied to the coil L.

  FIG. 22 is a circuit diagram for explaining that an external power source is supplied to a coil through a capacitor according to the present invention, and FIG. 23 is a cross-sectional view showing a state after the operation of the electromagnetic contactor of FIG.

  When an external power supply current is supplied to the coil 156, a magnetic field is generated around the coil 156, and the yoke 160 serving as a fixed core is magnetized by the magnetic field, and the entire fixed portion 180 (including the bobbin 150 and the yoke 160). ) Becomes an electromagnet. Due to the attracting force of the magnetized fixed part 180, the movable part 130 (the movable core 131 and the connecting member 132) descends toward the yoke 160 of the fixed part 180.

  Here, when the lower end portion of the movable core 131 descends and approaches the lower end portion of the yoke 160, the distance l decreases and the magnetic force F between the movable core 131 and the yoke 160 increases (see FIG. 18). ), The external power supply current supplied to the coil 156 when the movable contact 123 is turned on may be reduced. Therefore, the voltage applied to the coil 156 can be reduced by detecting by the changeover switch 172 that the lower end of the movable core 131 is lowered and approaches the lower end of the yoke 160.

  That is, when the lower end portion of the movable core 131 descends and approaches the lower end portion of the yoke 160, the switch operation protrusion 133a of the movable core 131 moves through the arc-shaped contact end 172a ′ formed on the switch operation lever 172a of the changeover switch 172. Press to turn off the contact of the changeover switch 172.

  Referring to FIG. 22, at the same time as the changeover switch SW is turned off, the external power supply current flows to the capacitor C and the voltage drops, and the reduced current is rectified by the rectifying element B / D and flows to the coil L.

  Since the magnetic force (attraction force) increases as the distance between the movable core 131 on which the magnetic force acts and the yoke 160 is shortened, the contact is maintained for contact and maintenance of the contact state even when the lowered current flows through the coil 156. The suction force of the portion 180 is sufficient.

  When a suction force is generated in the fixed portion 180, the lower end portion of the movable core 131 is lowered until it comes into contact with the lower end portion of the yoke 160, and the movable contact 123 mechanically connected to the movable core 131 is provided, as shown in FIG. By contacting the fixed contact 113, the main power is supplied to the load side.

  Therefore, according to the structure of the operation circuit unit 170 using the changeover switch 172 and the capacitor C according to the present invention, even if the coil 156 rises to the allowable limit temperature by reducing the current consumption flowing through the coil 156 (L). In addition to ensuring the operational reliability of the movable contact 123, it is possible to provide an electromagnetic contactor that can use the coil 156 (L) in a wide range of rated voltage usage.

  For example, in the conventional small-capacity electromagnetic contactor, the rated operating voltage of the coil capable of operating the movable contact is 48 V, whereas in the small-capacity electromagnetic contactor according to the present invention, the movable contact 123 is operated. Since the rated operating voltage range of the coil 156 (L) that can be made is as wide as 44 to 75 V, it is possible to ensure a wide range of product utilization in products of the same level.

  In addition, by changing the shape of the movable core 131 to secure the side space of the bobbin 150, the operation circuit unit 170 (PCB circuit unit) can be attached without increasing the size of the small-capacity electromagnetic contactor. In addition, the operation circuit unit 170 can be vertically installed on the side surface of the bobbin 150 so as not to be interfered with the movement of the movable unit 130, so that the internal space of a product with a limited size can be widely used. .

  Although the embodiment of the present invention has been described in detail above, the scope of the right of the present invention is not limited to the above-described embodiment, and the basic concept of the present invention defined in the claims is used. Various modifications and improvements by a trader are also included.

111 1st frame 112 2nd frame 120 Holder 125 Support guide part 131 Movable core 132 Connecting member 133 Switch operation part 133a Switch operation protrusion 134 Support stand 134a Insertion hole 135 Support pin 150 Bobbin 150a Bobbin main body 151 Coil power input terminal 152 Coil power Input member 153 Yoke insertion part 154 Hollow part 156, L coil 160 Yoke 160a (Yoke) upper end part 160b (Yoke) lower end part 160c Connecting part 170 Operation circuit part 171 Printed circuit board (PCB)
172 changeover switch 173, C capacitor 232 connecting member 233 switch operation part 233a switch operation projection 234 support base 234a sliding projection B / D rectifier

Claims (14)

Frame,
A bobbin provided inside the frame, having a hollow portion inside, and having a coil wound around the outer surface;
A movable core inserted into the hollow portion so as to be movable in the axial direction;
A yoke that is provided to face the outer surface of the bobbin and is spaced from the coil, and serves as a fixed core;
An electromagnetic contactor including an operation circuit unit disposed on one side surface of the yoke and disposed on the outer surface of the bobbin in parallel with the moving direction of the movable core.   The electromagnetic contactor according to claim 1, wherein the movable core is formed in a cylindrical shape.   The electromagnetic contactor according to claim 1, wherein the yoke is detachably coupled to a side surface of the bobbin. The yoke includes a first yoke and a second yoke configured to be able to contact and separate,
The first yoke and the second yoke are respectively
Contact portions that are spaced apart in the axial direction of the bobbin;
It is arranged in parallel with the moving direction of the movable core, and is composed of a connecting portion that connects the end portions of the contact portion,
The electromagnetic contactor according to any one of claims 1 to 3, wherein the contact portions of the first yoke and the second yoke are in contact with each other.   Each of the first yoke and the second yoke is provided with a semicircular opening in one of the contact portions to allow insertion of the movable core, and the other of the contact portions has a closed structure. The electromagnetic contactor according to claim 4, wherein the movement of the movable core is stopped. The operation circuit unit is
A printed circuit board (PCB);
A change-over switch provided on the printed circuit board, which is turned on / off opposite to the contact of the main circuit;
6. A voltage drop element provided on the printed circuit board for reducing a voltage applied to the coil by dropping an externally applied voltage when the changeover switch is switched. The magnetic contactor according to item.   The electromagnetic contactor according to claim 6, wherein the voltage drop element is a capacitor.   The electromagnetic contactor according to any one of claims 1 to 7, wherein the operation circuit unit includes a rectifying element that converts an external power source from AC to DC.   The said bobbin is arrange | positioned in the moving direction of the said movable core at the both ends of a bobbin main body, respectively, and is provided with the yoke insertion part which guides insertion of the said yoke. The magnetic contactor according to item. The frame includes a holder that is movably provided inside and includes a support guide portion to support the movable core,
The movable core is
A connecting member coupled to one end;
A support base provided on the connecting member and provided with insertion holes on both side surfaces;
The electromagnetic contact according to any one of claims 1 to 9, further comprising a support pin that is assembled through the insertion hole and is slidably inserted and coupled to an inner surface of the support guide portion. vessel.   The electromagnetic contactor according to any one of claims 6 to 10, wherein the change-over switch is integrally mounted on the operation circuit unit and modularized. The bobbin is
A coil power supply input terminal provided on each of the power supply side and the load side and connected to an external terminal;
The coil power supply input member that connects the coil power supply input terminal and the operation circuit unit and supplies the external power to the operation circuit unit is included. Electromagnetic contactor.   The electromagnetic contactor according to claim 12, wherein the changeover switch is disposed between the coil power supply input terminal and the rectifying element. The frame includes a holder that is movably provided inside and includes a support guide portion to support the movable core,
The movable core is
A connecting member coupled to one end;
A support base provided on the connecting member, provided with sliding protrusions projecting from both side surfaces toward each other, and being slidably coupled to the support guide portion. An electromagnetic contactor according to claim 1.

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